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36=54-9n
We move all terms to the left:
36-(54-9n)=0
We add all the numbers together, and all the variables
-(-9n+54)+36=0
We get rid of parentheses
9n-54+36=0
We add all the numbers together, and all the variables
9n-18=0
We move all terms containing n to the left, all other terms to the right
9n=18
n=18/9
n=2
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